Hour angle

Hour angle
Hour Hour, n. [OE. hour, our, hore, ure, OF. hore, ore, ure, F. heure, L. hora, fr. Gr. ?, orig., a definite space of time, fixed by natural laws; hence, a season, the time of the day, an hour. See {Year}, and cf. {Horologe}, {Horoscope}.] 1. The twenty-fourth part of a day; sixty minutes. [1913 Webster]

2. The time of the day, as expressed in hours and minutes, and indicated by a timepiece; as, what is the hour? At what hour shall we meet? [1913 Webster]

3. Fixed or appointed time; conjuncture; a particular time or occasion; as, the hour of greatest peril; the man for the hour. [1913 Webster]

Woman, . . . mine hour is not yet come. --John ii. 4. [1913 Webster]

This is your hour, and the power of darkness. --Luke xxii. 53. [1913 Webster]

4. pl. (R. C. Ch.) Certain prayers to be repeated at stated times of the day, as matins and vespers. [1913 Webster]

5. A measure of distance traveled. [1913 Webster]

Vilvoorden, three hours from Brussels. --J. P. Peters. [1913 Webster]

{After hours}, after the time appointed for one's regular labor.

{Canonical hours}. See under {Canonical}.

{Hour angle} (Astron.), the angle between the hour circle passing through a given body, and the meridian of a place.

{Hour circle}. (Astron.) (a) Any circle of the sphere passing through the two poles of the equator; esp., one of the circles drawn on an artificial globe through the poles, and dividing the equator into spaces of 15[deg], or one hour, each. (b) A circle upon an equatorial telescope lying parallel to the plane of the earth's equator, and graduated in hours and subdivisions of hours of right ascension. (c) A small brass circle attached to the north pole of an artificial globe, and divided into twenty-four parts or hours. It is used to mark differences of time in working problems on the globe.

{Hour hand}, the hand or index which shows the hour on a timepiece.

{Hour line}. (a) (Astron.) A line indicating the hour. (b) (Dialing) A line on which the shadow falls at a given hour; the intersection of an hour circle which the face of the dial.

{Hour plate}, the plate of a timepiece on which the hours are marked; the dial. --Locke.

{Sidereal hour}, the twenty-fourth part of a sidereal day.

{Solar hour}, the twenty-fourth part of a solar day.

{The small hours}, the early hours of the morning, as one o'clock, two o'clock, etc.

{To keep good hours}, to be regular in going to bed early. [1913 Webster]


The Collaborative International Dictionary of English. 2000.

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  • hour angle — n. Astron. the angle formed at the pole, or its arc on the celestial equator, between the hour circle of a celestial object and the observer s celestial meridian measured in hours, minutes, etc.: it represents the elapsed time since the object… …   English World dictionary

  • hour-angle — hourˈ angle noun (astronomy) The angle (usu measured as time) between the declination circle of a body observed and the observer s meridian • • • Main Entry: ↑hour …   Useful english dictionary

  • Hour angle — In astronomy, the hour angle is one of the coordinates used in the equatorial coordinate system for describing the position of a point on the celestial sphere.The hour angle of a point is the angle between the half plane determined by the Earth… …   Wikipedia

  • hour angle — The angular distance west of a celestial meridian or hour circle; the arc of the celestial equator, or the angle at the celestial pole, between the upper branch of a celestial meridian or hour circle and the hour circle of a celestial body or the …   Aviation dictionary

  • hour angle — noun 1. the angular distance along the celestial equator from the observer s meridian to the hour circle of a given celestial body (Freq. 1) • Hypernyms: ↑distance 2. (astronomy) the angular distance of a celestial point measured westward along… …   Useful english dictionary

  • hour angle — Astron. the angle, measured westward through 360°, between the celestial meridian of an observer and the hour circle of a celestial body. Cf. sidereal hour angle. [1830 40] * * * ▪ astronomy  in astronomy, the angle between an observer s meridian …   Universalium

  • hour angle — valandų kampas statusas T sritis fizika atitikmenys: angl. hour angle vok. Stundenwinkel, m rus. часовой угол, m pranc. angle horaire, m …   Fizikos terminų žodynas

  • hour angle — hour′ an gle n. astron. the angle, measured westward through 360°, between the celestial meridian of an observer and the hour circle of a celestial body • Etymology: 1830–40 …   From formal English to slang

  • hour angle — noun Date: circa 1837 the angle between the celestial meridian of an observer and the hour circle of a celestial object measured westward from the meridian …   New Collegiate Dictionary

  • Greenwich hour angle — hour angle measured from the meridian of Greenwich, England. * * * …   Universalium

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